Previous research on gender differences in behavior has led to seemingly contradictory findings. While some authors report that women are more generous than men, others report the opposite relative patterns of behavior. From data generated by 202 subject pairs, we find that women are more sensitive than men to the costs of generous actions when deciding whether or not to be generous. The factor...

This study uses competition diaries to see whether women and men differ in (a) what they compete over, (b) whom they compete with, and (c) their competitive tactics, including use of aggression. In Study 1, university students kept diaries of their competitive interactions during the term. Sex differences, few overall, were as follows: (a) men's diaries contained more same-sex competition, (b) ...

Women are generally assumed to be more talkative than men. Data were analyzed from 396 participants who wore a voice recorder that sampled ambient sounds for several days. Participants' daily word use was extrapolated from the number of recorded words. Women and men both spoke about 16,000 words per day.

In all the species of nonhuman primates for which data on sex differences in the frequency of yawning are reported, males yawn much more than females (Bertrand 1969; Deputte 1978; Goy and Resko 1972; Hadidian 1980; HA and DeVore 1965; Redican 1975; Rinaldi 1985; Wolfheim and Rowell 1972). This différence has been related to sexual dimorphism in canine size: The larger size of male canines may m...